When you are on a website, in front of an ATM or starting a game, sometimes you have to select your language. Usually, the buttons you have to click in order to pick your language are the flags of the 'main' country of your language:
For English, this is usually the flag of the USA, for German, the German flag and for Spanish, the Spain flag. The problem is that this is a bit problematic, it may feel a bit strange for somebody living in Mexico having to select the flag of Spain, for an Englishman to select the USA and for an Austrian to select the German flag.
I wonder why there are no symbols or icons for languages at all. Would be really useful.
Maybe this is because most people don't think about languages that much. Good example: Did you ever try to change the language of Google because it preselected a wrong language for you? Good luck:
The language names are written in the language which is currently active. If google selected 'chinese' for me here, I would have had no chance to switch it to English or German at all.